{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["geographical phenomenon", "event", "instrument", "disease"], "input": "For people with presbyopia and hyperopia , bifocal and trifocal glasses provide two or three different refractive indices , respectively , and progressive lenses have a continuous gradient ."}
{"geographical phenomenon": [], "event": [], "instrument": [], "disease": ["presbyopia"]}